package com.chuantou.yuba.util;

import android.text.Layout;
import android.text.Selection;
import android.text.Spannable;
import android.text.method.LinkMovementMethod;
import android.text.method.MovementMethod;
import android.text.style.ClickableSpan;
import android.view.MotionEvent;
import android.view.ViewGroup;
import android.widget.TextView;

public class ProfileLinkMovementMethod extends LinkMovementMethod {

	@Override
	public boolean onTouchEvent(TextView widget, Spannable buffer, MotionEvent event) {
		int action = event.getAction();

		if (action == MotionEvent.ACTION_UP || action == MotionEvent.ACTION_DOWN) {
			int x = (int) event.getX();
			int y = (int) event.getY();

			x -= widget.getTotalPaddingLeft();
			y -= widget.getTotalPaddingTop();

			x += widget.getScrollX();
			y += widget.getScrollY();

			Layout layout = widget.getLayout();
			int line = layout.getLineForVertical(y);
			int off = layout.getOffsetForHorizontal(line, x);

			ClickableSpan[] link = buffer.getSpans(off, off, ClickableSpan.class);

			if (link.length != 0) {
				ClickableSpan span = link[0];
				if (span instanceof ProfileSpan) {
					ProfileSpan profileSpan = (ProfileSpan) span;
					profileSpan.onKeyAction(action);
					widget.invalidate();
				}
				if (action == MotionEvent.ACTION_UP) {
					span.onClick(widget);
				} else if (action == MotionEvent.ACTION_DOWN) {
					Selection.setSelection(buffer, buffer.getSpanStart(span), buffer.getSpanEnd(span));
				}
				return true;
			} else {
				Selection.removeSelection(buffer);
				ViewGroup parent = (ViewGroup) widget.getParent();
				if (parent != null) {
					parent.onTouchEvent(event);
				}
				widget.invalidate();
			}
		}

		return super.onTouchEvent(widget, buffer, event);
	}

	public static MovementMethod getInstance() {
		if (sInstance == null)
			sInstance = new ProfileLinkMovementMethod();

		return sInstance;
	}

	private static ProfileLinkMovementMethod sInstance;

}
